1.	Simplify 1 Simplify the following expression: $$ \left(5 + -2\right)\left(-4 - 2\right) - 2\left(-1 - -1\right) $$ Correct Answer $$ -18$$ or -18.0000

2.	Simplify 2 Simplify the following expression: $$ 2\frac{-6}{3}\left(2 - -4 + 4\times5\right) $$ Correct Answer $$ -104$$ or -104.000

3.	Fractions 1 Simplify the following expression: $$ \frac{2}{3} + \frac{-3}{5} $$ Correct Answer $$ \frac{1}{15}$$ or 0.06666666666666665

4.	Fractions 2 Simplify the following expression: $$ \frac{4}{3}\frac{1}{5} $$ Correct Answer $$ \frac{4}{15}$$ or 0.26666666666666666

5.	Significant figures 1. Write the following to 2 significant figures: 0.000054231455 Correct Answer 0.000054 or $$5.4\times10^{-5}$$ 2. Write the following to 4 significant figures: 382.66398 Correct Answer 382.7 or $$3.827\times10^{2}$$

6.	Standard Form 1. Write the following in standard form to 3 significant digits: 236463 Correct Answer $$2.36\times10^{5}$$ 2. Write the following in standard form to 2 significant digits: 139.315 Correct Answer $$1.4\times10^{2}$$

7.	Significant figures 1. Write the following in preferred standard form to 3 significant digits: 134.72 Correct Answer $$135\times10^{0}$$ 2. Write the following in preferred standard form to 2 significant digits: 0.000412 Correct Answer $$410\times10^{-6}$$

8.	Simplify 2 Simplify the following expression: $$ \frac{2(-5)3}{\left(-6 - 6\right){(-1)}^{-4}} $$ Correct Answer $$ \frac{5}{2}$$ or 2.50000

9.	Simplify 1 Simplify the following expression: $$ {\left(-3 + -1\right)}^{2} - \left(5 - 5\right)\left(-2 + 1\right) $$ Correct Answer $$ 16$$ or 16.0000

10.	Simplify 2 Simplify the following expression: $$ \left(1 + 6\right)\left(-3 + -3\right) - {\left(\frac{5}{3}\right)}^{2} $$ Correct Answer $$ -42 - {\left(\frac{5}{3}\right)}^{2}$$ or -44.7778